While we count down to Pretty Little Liars' Halloween episode, here's a look back at the most scream-worthy shows to date. (Warning: MAJOR spoilers ahead!)

Pilot (Season 1 Episode 1)

Pilot (Season 1 Episode 1)

Of course, we have to give a shout out to the episode that kicked off one of the most nail-biting shows on TV! Okay, the pilot is nothing compared to some of the later drama, but thinking your murdered friend is haunting you via creepy texts is straight-up terrifying!

For Whom The Bell Tolls (Season 1 Episode 22)

For Whom The Bell Tolls (Season 1 Episode 22)

Ian and Spencer's late-night chase through the bell tower would be scary in and of itself, but when A showed up and pushed Ian to his death, we definitely jumped! But then five minutes later, we had chills up our spine, when the cops made it to the scene and Ian's body has already gone missing!